Sour-blue formulation



333,818 SDUB-BLU FQRMULA ON A.'Millsaps,;.l?liiladelphia, flnd'JllfialilL. Staubly, fireland, :P.a., .assignorsto sPennsalt Chemicals (Corpo- NoDrawing. Application} 31103112319 57 Serial No. 635620 7 V V in'v nticn i e ates 1 tb;.-laundry supplies .and, j-more rn tic arlv, mprev ment i in our+b1ue .fcnnulations.

ln commercial laundry operations it is; customary to swash she -fabric twice .wvith mixtures oftsoap :and alk li,

.-then give {a bleaching operation,- followed hy1three or vriourtriuses inwvater. This-usually leaves tracespf alikalinityainathe fabrics. Tofneutralize this alkalinity it is customary then tottreatxthefabric .With. a sour. ;-Itis l 21180, :customary toztreat :the fabric with av blue 'dyestu'ff to .-..0.Mereome..the tendency toward yellowingby enhancing tihegwhiteness. ;Usuall=y;-th esour;and the bluingoperations are-combined.

It has been found, however, that sometimes the blue.v dyestuii does not dissolve, with the result thatxsolid dye .particles attach themselvcsrtothe-fabrics. results :in a blue speck formationgbnblue streaks, upon ironing. a iVarifous iattempts'havezibeenmade .to overcome-this 2,893,818 Patented July 19.59

1 cold tap water in 14 seconds when tested as follows:

Add 0. 1 g. .HgSiF to 100 g. of Na SiF Then add .the Na CO blend thorough'lna'nd finally add 'thegdye with further mixin Test toithe time requiree for "the dye to dissolve, when one half g. of the formulais auded to 200 mls. of cold tap water. The absence of comet t'ails indicates completed solution of the dyestufi. It

hasbeenioundthatformulations inwhich allof the dye particles do not dissolve in 60 seconds cause trouble in commercial laundryoperations.

When a similar-product which contained no 'Na CO wastestedunder similar circumstances, -the dyestufi was completely insoluble in cold tap water.

Example '2 Parts Na SiF 100.0

v 11,0 7 Na CO Blue Dye-Colour Index 707 (RD-.8016) :07

.ablue:discoluratiomincluding the useof idiiferentdyestuffs,

excluding the possibility ofncontaminants .in the commer- -cial.s,odium fiuosilicate, ANagjSlF ,AClC., butthesewdid not offer a solution.

:Wehave discovered that the olf-grade batches of .sour :blue formulations contained free acidity, whereas there was no free acidity, ingood samples, and concludedlthat .this was..the result ofjrlee :acid "(-i;e., unreacted fluosilicic .acid, H Sil5f ,v .or. hydrochloric acid formed. in the reaction -and calculated vas H SiE in .thefcommcrcial jsodium fluosilicate. In other words, the dyestufi lostits water solubility from contact with'free acid present as contami-' pant in some batches of the sodium fluosilicate.

-We then conceived the possibility of maintaining dye "solubility in commercial sodium fluosilicater-evenin the presence of small amounts of fluosi licic acidgby theaddiw tion of small amounts of sodium carbonate, "Na CO a ve ifi t i ih ex ime By the term commercialv sodium fluosi-licate, as used Iherein ismeant a Sodium fluosilicate which, in the process o'fmanufacture may contain from.0.0 to..0.l5 of .freeacid calculated as fluosilicicacicl.

It is therefore an object of this inventiontoimprove sour-blue formulations.

' It is anotherobject to maintain dye solubility sour- .iblue formulationscontaining sodiumfiuosilicate even in a the presence of small amounts of fluosilicic acid.

It is affurtherobject topro'vide sour-blue formulations which will not cause speck formation ands'treaking when fabrics treated therewith are ironed.

With the ,.above.and other objects in view, which will become apparent as the description of the invention proceeds, we havese't forth ouriinvention the following sl m-P a i w s th Part ar Weight, whi are eiv n .by waytq ustxa icnaa t y way l m a Examp .1

Parts Na SiF 7 100.0

a s 1.0 Blue Dye-Colour Index 707 (RD-8016) 0.07

in Example 1 These components are mixed in the manner indicated th N HEz ina ed I0 vt e zs e and N32003:. V

The dye in this product dissolved completely in 24 seconds when tested as indicated in Example 51.

Example {3 Parts 'Na 'SiF 100.0 NaHF 1.0 H si-F g. 0. 1 Na CO :2-0

BluejDyeeColourIndex 707 (RD-.8016) g: 0.07

This product madeby-adding the ingredients in the order indicated, exhibited complete solution of the dye in '37 seconds.

Example 4 "H siF (as contaminant) 0.03 to 0.15 New. Y 2. CalcofluorWhite B concentrate "0.80 Blue Dye-Colour Index 707 (RD-8016) 0:07 Light paraffin oil 0.30

These components are mixed in the manner indicated in Example 1, the Calcofluor Whiteand the paraflin oil being added with the dyestufi.

When subjected to the testg'iven under Example 1,,the dyestufi in this formulati on dissolved completely in 30 e onds.

Example 5 Parts Na SiF V v v g 10.0.0 HgSlF (as contaminant) 0.03 to 0.15 Na CO V Calcofluor White B conc 10.80 Calcocid Blue 2R 0.08 Light paraflin oil 0.30

Thesecomponents are mixed as in ExampleA. The dye dissolved completelyin 20 seconds. The Calcocid Blue 707, is -rnade by An'ieriean Cyanamid Company, New York, N.Y., and is understood to be a sulfonated triphenylmethane.

These components are mixed as in Example 4. The dye dissolved in 21 seconds.

Example 7 Example 6 was repeated, substituting equal quantities of the alkalis indicated below for the Na CO with the satisfactory results, as indicated by the number of seconds required for the dyestufi to dissolve when tested as stated above:

Alkali: Seconds K2003 19 NaOH 14 Na SiO l3 Na SiO l5 N34P207 Na B4O7' Although the preferred alkali is Na CO similar but can be obtained by replacing the Na CO with K CO NaOH, Na SiO Na SiO Na P O or Na B O- 10H O, using substantially the same quantities of these other somewhat less satisfactory results, as indicated above,

materials. For satisfactory results in the practice of the present invention, the elimination of the blue speck or blue'streak formation must last for several months, due

to the time which has elapsed while the sour-blue formulation is in storage and the other alkalis indicated have been found to have this property.

The alkalis indicated are prefarably used in amount corresponding to 13% of the Na- SiF content although 2% is the preferred quantity, but larger amounts can be used with some sacrifice of the alkali-neutralizing efliciency of the sour-blue.

The H SiF is usually present in from 0 to 0.15% based on the Na SiF content.

Other dyestuffs found to be adversely aifected by H SiF when blended in Na- SiF containing free acidity (up to 0.15%) were:

(1) Amazo Violet SBS Conc., Cl. 698, New York I Color & Chemical C0., New York, N.Y.

. (2) Calcocid Violet 4BXL Conc., Cl. 698, American Cyanamid C0., New York, N.Y.

(3)'Kiton Fast Violet 4BNS Ex. Conc., Cl. 698, q

Ciba, New York, N.Y.

(4) Formyl Violet 54BP, Cl 698, General Aniline & Film Corp., New York, N.Y.

(5) C.P. Soluble Blue, Cl. 707, Imperial Paper &

Color Corp., New York, N.Y.

(6) Calcocid Blue B 200%, or. 707, American salt of the trisulfonic acid, together with some disulfonic acid, of 'triphenyltriamino-triphenyl-carbinol anhydride, and of diphenyltriamino-diphenyltolylcarbinol anhydride, or phenyldiaminosulphomethyl-fuchson-sulphophenylirn- :monium su1fonate.

The dyestuif can be varied according to its strength, but for dyestuffs of the character indicated above the preferred quantities are from 0.0S0.3% based on the Na SiF content.

It will be obvious that other components which are customary components of sour-blue formulations may be used and may be added to the above compositions, for example, the optical whitener which may be Calcofluor White B Conc. made by American Cyanamid Company,

New York, N.Y., may be used, and the customary amount is 0.8% based on the Na SiF content. Similarly, light paraffin oil may be used to prevent dust, and the customary amount is 0.3%.

Generally, the amount of laundry sour-blue added to laundered fabrics is suflicient to lower the pH to 5-6. However, more sour-blue may be used for heavily starched materials like shirts: The amount of sour-blue required to attain the desired lowered pH will vary-with efliciency of rinsing operations and alkalinity of 'the water supply. With low alkalinity water and efficient removal of alkaline detergents, by rinsing prior to souring, one ounce of sour-blue formulation to pounds of fabric is generally suflicient. As much as three or more ounces to 100 pounds of fabric may be required in laundries having high alkalinity water supplies.

It is apparent that many widely different embodiments of this invention may be made without departing from the spirit and scope thereof, and, therefore, it is not intended to be limited except as indicated in the ap pended claims.

We claim:

1. A laundry sour-blue comprising commercial sodium fiuosilicate, a blue dyestufi selected from the group consisting of Blue Dye-Colour Index 707 and Blue Dye- Color Index 698 and 0.1 to 3.0% of an alkali selected from the group consisting of sodium carbonate, sodium hydroxide, sodium orthosilicate, sodium metasilicate, sodium pyrophosphate and sodium tetraborate.

2. A sour-blue having the following composition:

Parts by weight Sodium fluosilicate 100.0 Fluosilicic acid (as contaminant) 0.15 N3-2C03 1-3 Blue Dye-Colour Index 707 0.05-0.23

3. A sour-blue having the following composition:

Parts by weight Nazsipg H SiF 0.1 Na CO 2-0 Blue Dye-Colour Index 7 07 0.08

References Cited in the file of this patent I UNITED STATES PATENTS Phair Mar. 15, 1932 Bishop Dec. 27, 1938 OTHER REFERENCES Soap and Sanitary Chemrfor July 1940, p. 62."- Soap and Sanitary Chem. for October 1948, pp. 43-46 (art by M. A. Lesser). 

1. A LAUNDRY SOURCE-BLUE COMPRISING COMMERICAL SODIUM FLUOSILICATE A BLUE DYSTUFF SELECTED FROM THE GROUP CONSISTING OF BLUE DY-COLOUR INDEX 707 AND BLUE DYECOLOR INDEX 698 AND 0.1 TO 3.0% OF AN ALKALI SELECTED FROM THE GROUP CONSISTING OF SODIUM CARBONATE, SODIUM HYDROXIDE, SODIUM ORTHOSILICATE, SODIUM METASILICATE, SODIUM PYROPHOSPHATE AND SODIUM TETRABORATE. 